Nicolas Chaillet

Principle of a Submerged Freeze Gripper for Microassembly

The development of reliable and repeatable strategies to manipulate and assemble microobjects lies in the efficiency, reliability, and precision of the handling processes. In this paper, we propose a thermal-based microgripper working in an aqueous medium. Manipulating and assembling in liquid surroundings can indeed be more efficient than in dry conditions. A comparative analysis of the impact of dry and liquid media on surface forces, contact forces, and hydrodynamic forces is shown. In addition, ice grippers represent flexible manipulation solutions. Nevertheless, when micromanipulation tasks are performed in air, capillary forces can drastically perturb the release. Our submerged freeze microgripper exploits the liquid surroundings to generate an ice droplet to catch microobjects, and to avoid capillary forces during the release. The thermal principle, the first microgripper prototype, an ice generation simulation, and the first tests are presented. The main objective is to validate the manipulation principle. Further research will be focused on control and optimization of the ice generation and the miniaturization of the system.

Radix-

In this brief, radix-

2^{r}

2^{r}

Arithmetic for Multiplication by a Constant

arithmetic is explored to minimize the number of additions in the multiplication by a constant. We provide the formal proof that, for an

Dynamic displacement self-sensing and robust control of cantilever piezoelectric actuators dedicated for microassembly

N

A New Recursive Multibit Recoding Algorithm for High-Speed and Low-Power Multiplier

-bit constant, the maximum number of additions using radix-

High-speed and low-power PID structures for embedded applications

2^{r}

A new low-power recoding algorithm for multiplierless single/multiple constant multiplication

is lower than Dimitrovs estimated upper bound

New high-speed and low-power radix-2 r multiplication algorithms

2 \cdot N/\log(N)

Microfabricated PMN-PT on silicon cantilevers with improved static and dynamic piezoelectric actuation: Development, characterization and control

using the double-base number system (DBNS). In comparison with the canonical signed digit (CSD) and the DBNS, the new radix-